I had the exact same problem in the game I just finished.
in fact, I came specifically to this board looking to see if others had the problem.
I was on the tiny earth map, with speed set to quick.
There werer 4 civs including me; US, Russia, Japan, and Rome.
I was going for a conquest victory, and I had took out Russia, and beaten down Rome good.
I waged a brief war with Japan, and when I signed peace, the tooltip said it would last for 10 turns.
This was around 1000 AD.
I could still not declare war on Japan in 2049, and thus had to take a timed victory instead.
It was an incredibly boring game, I sure hope this doesnt happen again.
Edit: I also experienced a similar bug with open borders deals. Afaik they are suppose to last for 25 turns.
Well, in the game I outlined above, as soon as the permanent peace kicked in, so did permanent open borders.
Also I gotta gripe about absolutely no way to cancel open borders anytime I want to in a game with 1upt. INCREDIBLY FRUSTRATING when my neighbors are eating up all the tiles in my territory with no way to cancel the open borders, or declare war.
in fact, I came specifically to this board looking to see if others had the problem.
I was on the tiny earth map, with speed set to quick.
There werer 4 civs including me; US, Russia, Japan, and Rome.
I was going for a conquest victory, and I had took out Russia, and beaten down Rome good.
I waged a brief war with Japan, and when I signed peace, the tooltip said it would last for 10 turns.
This was around 1000 AD.
I could still not declare war on Japan in 2049, and thus had to take a timed victory instead.
It was an incredibly boring game, I sure hope this doesnt happen again.
Edit: I also experienced a similar bug with open borders deals. Afaik they are suppose to last for 25 turns.
Well, in the game I outlined above, as soon as the permanent peace kicked in, so did permanent open borders.
Also I gotta gripe about absolutely no way to cancel open borders anytime I want to in a game with 1upt. INCREDIBLY FRUSTRATING when my neighbors are eating up all the tiles in my territory with no way to cancel the open borders, or declare war.